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Corn? Hydroton? There shouldnt be any root damage from watering unless youre doing some agressive watering.
You need to water/feed your plants. They are not looking too good.
Is your plant in veg or flower? If in flower then I would keep the pruning to a minimum because it could cause slowed growth and/or other unwanted effects. And if youre trying to clone in flower, then you might want to read up on revegging.
your plant is lacking turgor pressure. It may be running through water, but that doesn't mean its holding enough to keep the leaves up. I dunno about MJ in specific yet, but in majors biology it was apparent that a plant with low turgor may not have enough electrolytes/salts IN it to bring the water up nice and strong. So basically you probably have too much salts in your soil and its making osmosis work against your plant.
Looks like a classic sign of overfeeding!! Why did you put hydroton on top of your soil?? What is your soil mixture?? If you need a cheap but good soil mix, PM me. Check this out and you be the doctor. Only you know what you are doing and can fix. Good luck and happy growing!
When did u start feeding your plants with nutrients. Plants grown from seed could last up to a month with just water as their are nutrients in the soil to feed the plant during the early stages of growth.